Screw-threading machine.



PATENTED APR. 21, 1908. v. z. GARAGRISTI L G. W. TROXLER.

SCREW THREADING MACHINE.V

1 APPLIUATION FILED 4m49.- 19o?.

No. 885,016. y

3 SHEETS-SHBBT l.

WIW"

I at nu?.

`110. 885,016. l PATBNTED APB.. 21, 1908.

-V. z. GARAGRISTI L G. W. TRUXLER. SCREW THREADING MACHINE.

APPLIOATION FILED APR. 19. 1907.

3 SHEETS-SHEET 2.

No.- 885,016. PATENTED APR. 2l, 1908. V. Z. GARACRISTI & G. W. TROXLER.

SCREW THRBADING MACH '5.

APPLICATION FILED APR .19. 1907.

s SHEETS-SHEET a.

wimax@ s. 'H mummy;

.ally opening the dies of a screw UNITED sTATEs PATENT oEEieE. i

vIRGINIUs z. eARAeRIsTI, oF GRANITE,

AND GEORGE W. TROXLER, OF RCHMOND,

VIRGINIA.

SCREW-THREADING MACHINE.

Application mea April 19,

To allwhem it may concern.' Be it known that we, Vme'rNiUs Z. CARA- cRrs'rI and` GEORGE W. TRoxLER, citizens of the United States, the former residing at Granite, in the county of Chesterfield, State of Virginia, and the latter residing at Richmond, in the county of Henrico, State of Virginia, have invented a Screw-Threading Machine, of which the-following is a specification. V

The principalobjects of our invention are to provide certain mechanism for automaticthreading machine' to release the rod, bolt er pipe after the thread is cut thereon; to provide for readily and conveniently bringing different cutting dies into operative position so as to adapt the machine to cut threads of different sizes and pitch; and to improve the general construction of the machine soas to facilitate the operation of threading rods, bolts,

p1 es, etc. v

n the following specifications we have entered into a description of the construction,

operation and practical advantages of our invention, and what 4we claim as new is more carriage 3 specifically set forth in the appended claims.

In the accompanying drawings, which form a part of this specification:- Figure 1 is a side view of a screw threading machmeembodying our invention. Fig. 2 1s a lon itudinal sectional vieW through the die-hear. and drivingspindle upon which it is mounted. Fie. 3 is'a front elevation of the cutter-head. l* ig. 4 is an enlar ed sectional view, taken on the line 4-4 of 1,'and showing the carin mechanism for changing the cuttin r ies. i' 5 is a detail view of one of the dieolders.l Fig. 6 is a sectional view through the die-holder, on the line 6-6 of Fig. 5. Fig. 7 is a view illustrating the mechanism employed for o erating the die-holders. tional view through the head of one of the dieholders, to show the means for adjusting the cutting dies. Fig. Qis a detail view showing the means for op'eratinvr the yoke. a view showing a Inodiii dies. Fig. 11 1s aside view of vthe modification. Fi 12 is a sectional view on the line 12-12 o Fig. 16. v

In carryingl out our invention We employ any a prove( type of supporting frame, to provi( e a `be'arin box 1 and horizontal tracks 2, u on whlch latter moves the usual or feeding the stock to the diecation of the cutting Specification of Letters Patent.

Fig. 8 1s a detal sec- Fig. 10 is Patent-ea .apn-1 2,1, 190s. 1907. serial No. 369,144.

head, and in which carriage such stock, as the rod 4, is suitably held. The carriage is provided with an arm 3", ada ted to operate a push-bar 5, which actuates t 1e tripping mechanism, hereinafter described.

porting-frame is a hollow spindle 6, to t e rear end of which is keyed a driving spurgear 7, and said spindle is reduced and threaded, as at 6, and beyond said threaded portion is further reduced, as at 6", to receive the operating parts of the die-head.

8 designates the die-head, which is provided with a suitable number of active cutting-dies, in the present instance four, the vcutting edges of which are arranged concentric around the axis of the die-head so as to followeach other in cutting the thread upon therod, bolt or pipe. For the purpose of moving these cutting dies in and out of operative )osition with res ect to the' rod or bolt, and thereby provide or releasing the latter are each .carried at the outer end of a rod or spindle 9, which projects from a rock-shaft (see Fig. 6) so that when said shaft is turned the rod or spindle, and cutters carried thereby, will be moved radially with respect to the die-head and therefore o en and close.

The rod or spindle 9 exten through the shaft or cylinder 10, and is rotatable therein, and at its outer end is formed `with a cylindricalhead 11, to receive a number of cutting dies or chasers 12 which proyject `beyond the periphery of said head and are adapted to be brought into operative position with res ing said spin e, as' hereinafter ex lained. Instead of the thread-cutting dies s own in the drawings We also purpose using the ordinary skinning dies for forming what is known as a box tool. spindle 9 is extended beyond the shaft or cylinder 10 and has attached-thereto a spur-pinion 13, whichkmeshes with an internallytoothed gear-ring diskla which is threaded on the portion 6a of the driving-spindle. he teeth of the inions '13 and gear-ring 14 are of such lengt as to permit of the required movement of the spindles of the die-holders without disengaging said teeth; for, as will be hereinafterexplained, said ears not only rovide forturnlng the spind es 9 to bring ilerent cutting- Mounted in theioearing box 1 of the su after it hasbeen threaded, said cutting dies s longitudinally 1().at oneside ofthe center or axis thereof ect to the die-head by turn- The rear end of each 14 secured to a flanged lio dies or chasers into operative position, but

thereon, said ring being thereby adapted to operate the several die-holders simultaneously. Each pin 16 passes through a straight guide-slot 18 (Fig. 7) in the die-head, so that when the ring is shifted back and forth the pins-will travel in a straight line longitudinally of the die-head and engaging the walls of the cam-slots 15 will turn or rock the shafts 10. The ring 17 is shifted by means of a twopart yoke 19, which passes around said ring and at opposite sides of the die-head is provided with pins or trunnions 20 engaging in a groove 21 in the periphery of the ring. Between the upper ends of the parts of the yoke is a block l9aby which said yoke is pivotally supported on a threaded rod 22 projecting from and rotatable in the outer end of a bracket-arm 22a. The threaded rod is provided with a milled head 22b by which itis turned, and the pur ose of this rod is to provide for changing tlie location of the pivotpoint of the yoke so lthat the range of movement of the o erating-ring 17 may be varied. Between the lower ends of the partsof the yoke is 41 fixe to a shaft 42, the latter extending transversely across the supporting frame and is journaled in bearings 43 thereon. The shaft 42 has fixed on one of the outer ends thereof an arm 44, by which it is connected act 'to throw4 the yoke rearward, and the latto the push-bar 5,.said push-bar being slidably mounted in bearings 1a at the sides of the supportingframe. On the ush-bar are secured collars or buttons 45 an 458L against which the arm 3a of the carriage strikes to actuate said bar automatically as the carriage is moved'backward and forward. For the purpose of operating the yoke to quickly open the dies when the push-bar is moved rearward only a slight distance we employ a s ring 46 mounted on a rod 47 connected to t e lower end 19b of the yoke and interposed between a collar 48 on said rod and a stationary cross-bar on the frame. It will be seen, therefore, that when the carriageoperates the push-bar sufficiently to brin the connected links 4,() and 41 below the p ane of the opposite ends of said links the spring 46 will ter operating the ring 17 the pins 16 will be .moved in the slots and turn the shafts or cylinders 10 and open the dies.v In this operation the arm on the carriage engages the buttfon 45a. When the carriage is moved back- Ward the arm striking the button 45 will move the rod 5 and the latter by its connecting arm 44 will turn the shaft 42 so that the L 55- links will throw the yoke forward, andiin this ivoted a link 40 connected to a link` operation the links will-be swung upward to` the positionshown in Figs. 1 and 2 and serve to lock the yoke in this position, being held from further upward movement by means of the stop 50.

For'the purpose of locking the pinions 13 in engagement with the teeth of the gearring 14, as well as to hold the working or active cutting dies in o crative position each head 11 of the die-ho ders is engaged by a spring-actuated sliding catch 23, said catches being mounted in suitable recesses 8 therefor in the die-head, and are adapted to engage notches orrecesses 24 in the aforesaid heads 11. The sliding catches are mounted above the slots 18 through which the operating pins 16 pass, and are also slotted for the passage of said pins. These slots, 25, are of such length as to permit of the movement of the pins sufficient to operate the die-holders and without operating the slide or catch, but, as will be seen by reference to Fig. 7, an excessive rearward movement. of the pins 16 will en age the rear wall of the slot 25 and move t e slides or catches so that they will disengage. the heads 11 .of the die-holders. This movement is effected by turnin the screw-rod 22 after the lower end of theglever is thrown rearwardby operating the shaft 42 and the connecting-links. When the sliding catches are moved to disengage the heads of the die-holders the spur-pmions 13 will be free to turn, and bylturning the ear-ring the s indles 9 of said die-holders w1ll be turned t rough the intervention of said pinions so that another set of cutting-dies will be brought to operative position. In order that the sliding catches will maintain their engagement with the die-holders during the operation of merely opening and closing the dies, helical springs 26 are employed which bear at one end against the pins 16 and at the other end against said catch, being located for support in longitudinal recesses in the latter. The ends 23 of the sliding catches are reduced and beveled so as to engage the recesses 24 in the die-holders and properly cutting-dies or chasers, in the present instance four, as in Fi 8, and-these are located in recesses in the cy 'ndrical heads of the dieholders and are adjusted by means of a screw 27 having a head 28 at its inner end with a beveled face which rides upon the correspondingly beveled inner end of the cutting-die or chaser; the said die-holder bein recessed, as at 29, to ermit of the re uire movement of the head) of the screw. t will be obvious, therefore, that by turning the screw 27 in one direction the cutting-de will be moved outward and when said screw is turned in the other direction the cutting die may be pushed inward, and-when properly adjusted it is securely vheld by means of a set-screw30, (see Figs. 3 and 8); Y

j Instead of employing the straight cuttingdies or chasers, as shown in Figs. 3 and 8, we also pur ose using a 'eculiar form of cuttingdie, asi ustrated in lii this instance the cuttlng die 60, `is curved longitudinally, is rectangular in shape, and has the cutting teethcut p'arallel with the longitudinal edges thereof. For the purpose h iof setting these dies sothat the cutting ed" e of each will be dis osed at an inclination t e ,recess in the hear 61 is inclined at its inner the screw bears a ainst the face ,of the die? holder head 61. so, asin theformer case, a set-screw 67 is'employed for securing the cutting-die after it is properlyadjusted. It will be understood that 1n this form of dieholder one side'of the curved recess which rej ceives the cutting-die is grooved so as to receive the cutting teeth.

From the foregoingdescription, in connection with the accompanying drawings, the construction and operation of our improved screw threadin machine will be readily understood; for t e yoke 19 being moved forward the cutting dies will be in o erative position to cut a thread on the rod, holt or pi e, and the length of the thread determined lby the adjustment of the button 45a on the push-rod 5.- As the thread is being cut the arm 3a of the carriage approaches said button, and striking the same will move the rod and the latterbeing connected to the transverse shaft 42 by the arm 44 will rock or turn said yshaft in the direction to swing' the links 40 and 41 downward so that the spring 46 may act to throw the yoke, which latter will' i then operate the die-holders through the ring 17 so as to oen the dies and release the threaded rod, oltor pipe.- The carriage is then moved backward or away from the diehead and striking the button 45 will operate the rod 5 so that the yoke is thrown forward to move the dies into operative position for cutting another thread.

N ow when it is desired to bringanother set of'cutting dies into operative position it is only necessary to operate the trl ping mechanism so that the yoke will be tfirown backward by the spring, and then turn the milled wheel 22b so that the threaded rod will impart a further rearward movement tothe oke, orv sufficient-to operate the catches 23. he die-holders bein thus disengaged the ear-ring 14 is turne in either direction to ring the next set of cutting-dies into position; after which the threaded rod is ttirned gs. 10,11 and '12. in

to lrestore the normal location of the point of the yoke. 1

-Iiaving thus described our invention, what we claim 4as new, and desire to secure by liettcrs-latent, is j 1. Ina screw threading machine, the combination with the die-head, of a rock-shaft journalcd thereinl at one side of the work opening, a head rotatably mounted'on'the forward end of the rock-shaft with its axis at one side of the axis of said rock-shaft, said rotatable headcarrying apluralityof cuttingdies, means 'engaging the rotatable head to pivot- -locatc any one of the cutting-dies `in operative position with respect to the work open ing of the die-head, and means for rocking the shaft, whereb7 the cutting-die is movable radially in the r ie-head. v

2. In a screw threading machine, the combination with the die-head, of a rock-shaft journaled therein and having a cam-slot, a rotatable spindle projecting from the forwardend of the rock-shaft with its axis at one side of the-axis of said rockeshaft, a cuty ting die attached to the outer endof the spindle and movable radiall with respect to the die-head, and a stop on te die-head en aging the cutting die to prevent rotation of t e latter while it is moved radially; y together with a ring encircling the die-headand having a pin operativel engaging the cam-slot, and

means for shi lting the rlng.

3. In a screw-threading machine, the combinationwi'th the die-head,ofarockshaft j ournaled therein at one side ofthe work-opening, a spindle projecting from the forward end of t e rock-shaft at one side of the axis thereof, a head on-said spindle carrying a plurality of cutting dies, and means for adjusting the spindle to bring any one of the cutting dies into operative osition with respect to the work o ening o the die-head; together with means or rocking the shaft, whereby the cutting die is mova le radially in the die-head.

4. In a screw-threading machine, the combination with the driving s indle, of a gearring secured thereto, a die-head loosely mounted on the spindle, rock-shafts journaled in the die-head, spindles extending longitudinally throu h the rock-shafts, each spindle being locate( at one side of the axis of its shaft and carryin a plurality of cutting dies at its forward en inions on the rear ends of said spindles an in mesh with the aforesaid gear-ring, means for securing the spindles to the die-head, and means for turning the rock-shafts, substantially as shown and described.

5; In a screw-threading machine, the combination with the driving s indle, offa gearring vsecured thereto, a cie-head loosely of its shaft and carryin a plurality of cutting mounted on the spindle, rock-shafts journaled in the die-head and having cam-slots, spindles extending longitudinally through the rock-shafts, each spindle being located at one side ofthe axis of its shaft and carrying a plurality of cutting-dies at its forward end and having recesses with relation to the cutting-dies, pinions'at the rear ends of the spindles in mesh with the gear-ring, vand sliding catches on the die-head adapted to engage the recesses and lock the spindles; together with a shiftable ring mounted on the die head and-having pins which engage the cam-slots and catches, substantially as shown and described.

7. In a screw-threading machine, the combination with the driving-spindle, of a gearring secured thereto, a die-head loosely mounted on the spindle, rock-shafts journaled in the die-head and havin cam-slots, spindles extending longitudina y through t e rock-shafts, each spindle bein located at one side ofthe axis of its shaft an carrying a plurality of cutting dies at its forward end and having recesses with relation to the cutt ting-dies, pinions at the rear ends ofthe spindles in mesh with the gear-ring, and sprlngactuated catches located in the die-head and adapted to engage the recesses of the dieholders, said catches slots alining with the aforesaid cam-slots; together with a shiftable ring mounted on the die-head and having pinsengaging in the slots in the rockshafts and catches, substantially as shown and described.

8. In a screw-threading machine, the combination with the driving-spindle, of a gearring secured thereto, a die-head loosely mounted on the spindle and having straight slots in the sides thereof, rock-shafts journaled in the die-head and having cam-slots ada ted to aline with the slots in said diehea spindles extending longitudinally through the rock-shafts, each spindle being located at one side of the longitudinal center,

of the rock-shaft and carrying a plurality of cutting-dies at its forward end and having recesses with relation to the cuttin -dies, pinions at the rear ends of the spin les in mesh with the ear-ring, and sliding 'catches on the die-hea adapted to engage the recesses in the spindles and having slots alining with the slots in the die-head; together with a shiftable ring mounted on the die-head and having pins engagin in the slots in the catches, die-head an rock-shafts, substantially as shown and described. '9. In a screw-threading machine, the combination with the driving-spindle, of a gearring secured thereto, a die-head loosely mounted on the spindle and having straight slots in the sides thereof, rock-shafts journaled in the die-head and each carrying a plurality of cutting-dies' at its forward end and a plnion at its rear end, the latter meshing with the gear-ring, said rock-shafts having cam-slots alining with the slots in the diehead, means on the die-head for enga in the cutting-dies, and arng encirclin the ieead and having ins engaging the a oresaid slots, and means for shifting said ring.

10. In a screw-threading machine, a dieholder having a curved recess therein with an inclined rear wall, a rectangular cutting die curved to fit said recess and engaging the inclined wall thereof, and means for adjusting said die longitudinally and securing it in the die-holder.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

- vIEGiNiUs Z. cAEAcRIsTI.

GEORGE W. TRoxLER.

Witnesses:

W. M. MYERS, E. W. MARABLE. 

